. >> reporter: an internal nsa audit in other top secret files revealed there were more than 2,000 violations in the recent 12-month period, mostly unintentional. the nsa says when mistakes are made, the agency reports the issue internally and to federal overseers and aggressively gets to the bottom of it. but the new report raises concerns about that balance of power. the "washington post" reported the chair of the senate intelligence committee diane feinstein wasn't even aware of the audit until it was reported in the paper. feinstein disputes that, but in a statement admitted that the committee can and should do more to independently verify that nsa's operations are inappropriate and that its awareness of incidents are accurate. and the top judge on the secretive court that approves surveillance programs says judges aren't able to independently verify whether the government violates the law, saying they are, quote, forced to rely upon the accuracy of the information that is provided to the court. critics have been demanding more oversight. >> why is the government spying on its own people?